Heavy-Duty Mil-Spec Corrugated Cartons Built to ASTM D5118
Military Packaging supplies mil-spec V3C and W5C corrugated boxes built to ASTM D5118 for weather-resistant shipping and long-term storage. These heavy-duty cartons use water-resistant adhesives and treated liners to protect defense, aerospace, and government shipments through humidity, rough handling, and years on the shelf. Order them on their own or as part of a complete, compliant packaging system we engineer around your equipment.
V3C and W5C name two weather-resistant grades of corrugated fiberboard box built to the military packaging standard ASTM D5118. Unlike the plain corrugated you find in ordinary shipping, these cartons combine water-resistant adhesives, treated liners, and heavier construction to survive conditions that collapse a standard box.
We supply both grades so you can match the level of protection to the demands of your shipment, from a domestic depot transfer to an overseas deployment. When your program calls out weather-resistant fiberboard, these boxes answer the requirement.
Every V3C and W5C box we supply earns its place in a mil-spec shipment:
V3C delivers strong water resistance for demanding shipments that face humidity and handling moisture. W5C raises the bar with a higher level of weather resistance for the harshest conditions, including extended exposure and severe climates.
We walk you through the choice based on your load weight, handling profile, storage timeline, and destination, so you get the protection you need without paying for more than the job requires. When you are unsure, send us your requirement and we will recommend the grade.
Moisture is the enemy of packaging strength. Ordinary corrugated absorbs water, loses rigidity, and buckles under load. Our weather-resistant boxes resist that failure.
The treated liners repel moisture instead of soaking it up, and the water-resistant adhesives keep the flutes and facings bonded even in damp conditions. The carton holds its shape, its stacking strength, and its protective structure from the moment you seal it to the moment it is opened, whether that is next week or next year.
Programs across the defense and aerospace supply chain rely on V3C and W5C boxes:
V3C and W5C boxes protect shipments across every sector that answers to military packaging standards:
The right box depends on what you ship and where it goes. Keep these factors in mind, and reach out if you want a recommendation:
We supply V3C and W5C boxes in a range of sizes and build to your dimensions when a stock size does not fit. Beyond the box itself, we add die-cut inserts, partitions, and reinforcement where your contents need extra support.
Because we source and build to order, you get a carton engineered for your equipment rather than a generic box you have to work around. Tell us your contents and we will recommend the construction that protects them best.
Weather resistance is engineered into the board, not sprayed on. The adhesives that bond the liners and fluting are formulated to hold in damp conditions, so the box keeps its structural bond where standard glue would let go. The facing liners are treated for wet strength, which means they resist absorbing moisture and hold their rigidity even in humid air.
Together, these features keep the carton’s stacking strength and shape intact through humidity, temperature swings, and long storage, the conditions that quietly weaken ordinary corrugated until it fails.
Many of our customers order the same boxes again and again for active programs. We make that repeatable, holding your sizes and grades on record so reorders move quickly and arrive consistent with what you approved. Whether you need a single run or a steady supply across a long program, we plan production and turnaround around your schedule so you always have compliant cartons on hand when you need them.
It helps to know exactly what you gain by moving up from standard corrugated. A standard box is built for dry, controlled conditions and begins to weaken the moment it meets sustained humidity or moisture. Its glue lines soften and its walls lose rigidity, which puts the contents at risk.
A weather-resistant V3C or W5C box is built for the opposite world. It holds its bond and its strength in damp, rough, and long-storage conditions, so it protects your shipment where a standard box would give out. When your contents matter and the conditions are uncertain, the upgrade pays for itself.
We manufacture these boxes to ASTM D5118, the standard that governs weather-resistant fiberboard shipping containers for military use. That compliance matters because it tells your inspectors and your customers that the carton meets a known, tested benchmark rather than a vague promise of durability.
The boxes also support compliant MIL-STD-129 marking, so your identification, barcodes, and shipping data appear exactly where the supply chain expects them.
A box is the outer shell of a complete system. We pair V3C and W5C cartons with mil-spec barrier bags and desiccants for sealed moisture protection, chemically neutral wrap for delicate surfaces, and reusable cushioning to control shock and vibration.
When your equipment needs more than a box, we build the whole package so every layer works together and meets spec.
Tell us what you are shipping, how much it weighs, and where it is headed, and we will recommend the right grade and size. We supply boxes on their own or as part of a full packaging system, and we confirm availability and turnaround with your quote.
From a single spec-driven order to a recurring supply for an ongoing program, we make sourcing compliant cartons straightforward.
We know mil-spec packaging inside and out, and that focus works in your favor. We match the right grade to your requirement instead of overselling, we supply from a single source so you avoid juggling vendors, and we back every order with compliance you can ship on. When your equipment has to arrive intact and inspection-ready, our V3C and W5C boxes give it a rugged, dependable start.
Both are weather-resistant grades built to ASTM D5118. V3C provides strong water resistance for demanding shipments, while W5C offers a higher level of weather resistance for the toughest conditions. We help you choose the right grade for your load, handling, and environment.
They are weather and water resistant rather than fully waterproof. The treated liners and water-resistant adhesives resist moisture and humidity far better than standard corrugated. For sealed moisture protection, we pair the boxes with barrier bags and desiccants inside.
We supply a range of sizes and can source or build to your dimensions. Share your contents and load, and we will recommend the box that fits your shipment with minimal wasted space.
Yes. We build them to ASTM D5118, and they support compliant MIL-STD-129 marking, so they satisfy the fiberboard and labeling requirements common to defense and aerospace programs.
Yes. We combine V3C and W5C boxes with barrier bags, desiccants, wrap, and cushioning into one compliant system engineered around your equipment, so you source everything from a single supplier.
Tell us what you are shipping, how much it weighs, and where it is headed, and we will recommend the right grade and size and get you a quote.
